Answer:
9 and 3.35 respectively
Explanation:
Mean=Sum of data÷No. of data
=(3+5+6+9+11+12+17)÷7
=63÷7
=9
Standard Deviation=√{(sum of squares of data÷no. of data)-(sum of data÷no. of data)
=√(705÷7)-(63÷7)
=√100.71÷9
=√11.19
=3.35
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